Question 1

Which of the following best describes a hydrogen bond?

Accepted Answer

An intermolecular force between a hydrogen atom bonded to a highly electronegative atom and another electronegative atom.

Question 2

Which of the following molecules is most likely to form hydrogen bonds with water?

Accepted Answer

Ammonia ($$NH_3)$$

Question 3

A student observes that water forms droplets on a waxy surface but spreads out on clean glass. Which property of water explains this behavior?

Accepted Answer

Water's polarity and ability to form hydrogen bonds

Question 4

Which of the following statements about polar molecules is correct?

Accepted Answer

Polar molecules have regions of partial positive and partial negative charge.

Question 5

Why do hydrogen bonds in water break and reform rapidly?

Accepted Answer

Hydrogen bonds are weak intermolecular forces that are easily disrupted by thermal motion.

Question 6

Which of the following best explains why oil and water do not mix?

Accepted Answer

Oil molecules are nonpolar and cannot form hydrogen bonds with water.

Question 7

A molecule has a partial negative charge on one end and a partial positive charge on the other. What is this molecule called?

Accepted Answer

Polar molecule

Question 8

Which of the following is a real-life example of hydrogen bonding?

Accepted Answer

The high boiling point of water compared to similar-sized molecules

Question 9

Which equation correctly represents the formation of a hydrogen bond between two water molecules?

Accepted Answer

$$H_2O \cdots H_2O$$

Question 10

Which of the following best describes the term 'intermolecular force'?

Accepted Answer

A force that exists between molecules.

Question 11

A student mixes hexane ($$C_6H_{14}) $$and water in a beaker. What will most likely happen?

Accepted Answer

Hexane and water will form two separate layers.

Question 12

Which of the following is NOT a property of water due to hydrogen bonding?

Accepted Answer

Low boiling point

Question 13

Which of the following best explains why salt ($$NaCl) $$dissolves in water?

Accepted Answer

Water molecules are polar and stabilize the positive and negative ions.

Question 14

Which of the following is an example of a nonpolar molecule?

Accepted Answer

Methane ($$CH_4)$$

Question 15

Which of the following best describes the partial charges in a water molecule?

Accepted Answer

The oxygen atom has a partial negative charge and the hydrogen atoms have a partial positive charge.

Intermolecular Forces and Molecular Polarity: Study Notes

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